In other words:
No. You only need your email address for registration. No payment details are required and you do not start any subscription yet.
So you don't have to cancel anything before the trial ends.
Once your 32-day trial has passed, you'll keep your BANDZONE account, but you won't have access to your band data anymore. You can decide at any time to continue using BANDZONE via a subscription or a one-time payment, delete your account or 'leave it as is', for example to just receive our newsletter.